Welded receiver.



V. ANDERSON.

WELDED RECEIVER.

APPLICATION FILED APR. 3, 1912.

1,063,237, 7 Patented June 3, 1913.

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bars, the pole pieces and magnet bars being UNITED STATES .io-FFiicE.

VICTOR ANDERSON, OF NEW YORK, N. Y., AS

OF NEW YORK, N. 'Y., A CORPORATION OF ILLINOIS.

snmon TO wns'rnmi ELEc'rnlIo comrm,

WELDED RECEIVER.

Application filed Apr'i13, 1912. Serial No. 688,200. I

ers, more particularly to receivers of the bipolar type, in which the relation between the diaphragm and the pole pieces is such that it is impossible to throw them out of adjustment.

An object of this invention is to provide a magnet system for telephone receivers in which the use of bolts or rivets is avoided, all parts of the system being welded together Another object of this invention is to permanently attach the cup to the magnet system between the pole pieces and the magnet electrically welded together, and forming, with a cup, a unitary structure.

In the drawings'Figure 1 is a sectional view of a telephone receiver showing the spacing piece between the two bar magnets and the pole pieces welded to the end of the bar magnets and held spaced apart by the cup; Fig. 2 is a sectional view of the receiver taken at right angles to that of Fig. 1, showing the position of the coil on the pole piece and the connectors passing through the cup; Fig. 3 is a detail perspective view of the magnet system showing the manner of clamping the cup between the shoulders on the pole piece and the bar magnet.

Referring to the drawings, 10 and 11 designate two bar magnets spaced apart at their rear end by the spacing piece 12, this spacing piece 12 being electrically welded to the bar magnets. At the forward end of the bar magnets 10 and 11 are electrically welded pole pieces 13 and 14: respectively. These pole pieces are provided with a forwardly extending part 20 having shoulders 21 providing a stop for the energizing coils. The rear ends of the pole pieces are provided with an extending portion 22 having shoulders 23. The cup 24 isprovided with perforations through which extend the portions 22 of the pole .pieces, -The pole pieces 13 and 14 are electrically welded to the bar magnets 10 and 11 respectively, thus clamping the cup- 24 between the forward end of the bar magnet and the shoulder 23 of the pole pieces. This arrangement insures that the distance between the pole pieces is main tamed constant under all conditions of service.

Connectors 25-are shown passing through the cup 2% and insulated therefrom by the insulating bushing 26 and the insulating washer 27. The connectors are provided with asorew-threaded portion 28 on which is screwed a nut 29 thereby clamping the connector'firmly to the cup. A forward extension 30 is provided for the connector to which the terminal 31 of the energizing magnet 32 is attached. The connector is provided with the usual binding screw 33 by means of which the usual leads are at tached. The connectors are insulated from the magnet system by a fiber sheet 3 1.

The usual diaphragm 35 rests on the surface 36 of the cup 24 and in position to be acted on by the pole pieces 13 and 14.

The structure above described forms a unitary structure; that is, placed in usual receiver case 38 and clamped within the case by the usual cap 37. l

I claim:

1. In a telephone receiver, the combination of a magnet, a pole piece welded thereto, and a cup clamped between the pole piece and the magnet.

2. In atelephone receiver, the combination of a magnet of the horse-shoe type, pole pieces for said magnet provided with shoulders, said pole pieces being welded to said magnet, a cup clamped between the pole pieces and the magnet by the shoulders on the pole pieces, said cup holding the pole pieces in fixed relation to each other.

3. In a telephone receiver, in combination a cup, and a magnet having soft iron cores provided with shoulders, said cores extending through holes in the cup and being welded to'the magnet, whereby the cup is clamped to the magnet by means of the shoulders on said cores.

111 a telephone receiver, in combina- Specification of Letters Patent. PatentdJune 3,1913, I

tion, a magnet system comprising two bar and acting as a spacing means for the pole magnets spaced apart, a spacing stud sepieces. 10 cured between the ends of the magnets, pole In witness whereof, I hereunto subscribe pieces for said bar magnets provided with my name this first day of April A. D. 1912.

shoulders, said pole pieces welded to the bar VICTOR ANDERSUN. magnets at the end remote from the spacing Witnesses: stud, and a cup clamped between the shoul- FRANK Toonny,

ders on the pole pieces and the bar magnets W. F. HOFFMAN. 

